Just a little QOL suggestion - being able to pause during a slide show whether its because you need to quickly windows key to something or need an emergency trip to the potty 
I think it would be easy to implement in under 30 minutes, maybe even less.
Like in the screenshot; the pause button would be located in between “next” and “previous”. It would contain “||” in either a small red box or a small red circle. The font and color would be the same as everything else.